I didn't see any obvious reason that the drawable limit should be 4096, but it is possible there is another limit in Nox that I didn't patch. If you have a map that reproduces the issue, I can take a look.

Sorry for being less active, after spending too much time on this for a few weeks I had to get some actual work done. The last thing I was working on was creating new things through lua. It is about half completed. Hopefully I'll have some time to work on it more over the next couple of weeks.